KR100842199B1 - High durability touch panel - Google Patents

Abstract

The present invention provides a touch panel comprising: a first panel plate having a first base layer and a first conductive thin film disposed on one side of the first base layer; And a second panel plate having a second conductive thin film disposed on one side of the second base layer and the second base layer, in which case the first panel plate and the second panel plate are disposed with spacers interposed therebetween. The first conductive thin film and the second conductive thin film face each other, and the distance between the first conductive thin film and the second conductive thin film is 20 to 100 μm, and the touch panel is 1.5 mm from an electrode provided at the end of the first panel plate. It provides a touch panel with a push angle of 3.9 ° or less at the point of distance.

Description

High durability touch panel {HIGH DURABILITY TOUCH PANEL}

1 shows a cross-sectional view of an embodiment of a touch panel according to the invention.

2 is a cross-sectional view of another embodiment of a touch panel according to the present invention.

Fig. 3 shows that silver electrodes are formed at the ends of the upper and lower panel plates, and shows the position (position from the silver electrode: distance r) for measuring durability for the input short press pen.

4 shows the pressing angle θ at a point (r = 1.5 mm) 1.5 mm away from the silver electrode provided at the end of the panel plate.

5 shows an outline of linear measurements.

According to the present invention, a pair of upper and lower panel plates having a conductive thin film are opposed to each other with a spacer therebetween so that the conductive thin films are opposed to each other, and at least the upper panel plate on the pen input side has a plastic film as the base layer. It relates to a panel and an image display using the touch panel.

Thin films having electrical conductivity through which light in the visible region is transmitted are typically transparent for display systems such as liquid crystal displays and electroluminescence displays, for example touch panels. electrodes) and is used for antistatic and electromagnetic wave shielding of transparent articles.

As the transparent conductive thin film, so-called conductive glass including a glass plate on which an indium oxide thin film has been formed is conventionally used. However, since glass is used as the base, the conductive glass may be inferior in flexibility or processability and may not be used depending on the application.

Thus, in recent years, conductive thin films using various kinds of plastic films containing polyethylene terephthalate as a base have been used because of various advantages such as flexibility, processability, impact resistance and light weight, for example. However, since the transparent conductive thin film having a plastic film as the base layer has a large light reflectance on the thin film surface, this transparent conductive thin film has a problem of inferior transparency. In addition, the transparent conductive thin film has a problem of inferior durability, such as friction resistance and flex resistance, and if damaged during use, the electrical resistance is increased or the connection is disconnected.

In particular, in a touch panel in which the conductive thin films face each other by arranging a pair of upper and lower panel plates having conductive thin films to face each other with spacers therebetween, the conductive thin films are strongly in contact with each other by a pen input from the upper panel plate side. . Therefore, it is desirable that the touch panel has satisfactory durability that can withstand the contact, that is, durability with respect to the pen input.

However, when a panel plate having a plastic film as the base layer is used for at least the upper panel plate on the pen input side of both panel plates, the touch panel is inferior to the pen input due to insufficient bending resistance and the like of the conductive thin film, and as a touch panel. Endurance life is reduced.

In order to solve this problem, the applicant has proposed a transparent conductive laminate in which a conductive thin film is formed on one side of a plastic base layer having a thickness of 2 to 120 μm and another plastic base layer is attached to the other side through an adhesive layer (JP 2002-326301 A). This transparent conductive laminate is excellent in durability, such as bending resistance. Thus, by using the transparent conductive laminated product on at least the upper panel plate on the pen input side of the touch panel, the durability to the pen input can be improved and the durability life of the touch panel can be extended.

However, in recent years, since the edge of the touch panel is made narrow when designing the touch panel, durability against the pen input is greatly required near the electrode provided at the end of the panel plate. In addition, as the touch panel is started to be used, in the design of the touch panel, not only the upper panel plate on the pen input side but also the lower panel plate facing the upper panel plate is made of a plastic base layer, which is a liquid crystal cell cell) to a glass plate of a display device.

Under these circumstances, the proposal suggests that the transparent conductive laminate may not sufficiently cope with the durability to pen input near the electrode provided at the end of the panel plate. Touch panels of this type, in which the lower panel plate is also made of a plastic base layer, are particularly inferior to the pen input near the electrodes provided at the ends of the panel plate.

In view of this situation, the present invention relates to a touch panel using a panel plate having a base layer comprising a plastic film. The purpose of the present invention is to improve the durability of the pen input near the electrode provided at the end of the panel plate (hereinafter referred to as "short press pen input durability").

The inventor of the present invention has thoroughly investigated to solve the above problems. As a result, the inventors have established that in a touch panel using one or more panel plates having a base layer comprising a plastic film, the gap between the upper and lower panel plates is set to the distance between a specific range of conductive thin films where no Newton ring phenomenon occurs. If the pushing angle at a point 1.5 mm from the electrode provided at the distal end of the panel plate becomes equal to or smaller than the prescribed value, the durability can be improved for the short-pressing input pen.

In addition, in the touch panel using the plastic base layer in the upper panel plate and the lower panel plate, in addition to reducing the gap, the thickness of the adhesive layer for attaching the lower panel plate to the glass substrate of the display device does not interfere with the adhesive force. It is found that the durability to the short-press input pen is improved if the non-adjustable pen is adjusted to a certain range of thickness and the press angle at a point 1.5 mm away from the electrode provided at the end of the panel plate is equal to or smaller than the prescribed value. It was.

Further, in addition to the above means, a conductive thin film is formed as an upper panel plate on the pen input side with a thickness of 2 to 120 μm on one side of the plastic base layer, and another plastic base layer is attached to the other surface through the adhesive body. It has been found that the conductive stack can be used to improve the durability of the short press input pen.

The present invention mainly relates to the following items.

1. A touch panel comprising: a first panel plate having a first base layer and a first conductive thin film disposed on one side of the first base layer; And a second panel plate disposed on one side of the second base layer and the second base layer. In this case, the first panel plate and the second panel plate are disposed with the spacer interposed therebetween, so that the first conductive thin film and the first panel plate are disposed. The two conductive thin films face each other, and the distance between the first conductive thin film and the second conductive thin film is 20 to 100 μm, and the touch panel has a pressing angle at a point of 1.5 mm from the electrode provided at the end of the first panel plate. It is 3.9 degrees or less.

2. The touch panel of item 1, wherein the first base layer comprises a plastic film and the second base layer comprises a glass layer.

3. The touch panel of item 1, further comprising a first adhesive layer having a thickness of 2 to 30 μm, wherein the second panel plate is disposed on the glass plate of the image display apparatus through the first adhesive layer, in which case the first base The layer comprises a plastic film and the second base layer comprises a plastic film.

4. The method of item 1, further comprising: a second adhesive layer; And a third base layer comprising a plastic film, wherein the first base layer has a thickness of 2 to 120 μm and the base layer is different from the first base layer opposite to the side on which the first conductive thin film is disposed. It is arranged through the second adhesive layer on the side.

5. An image display apparatus, comprising: a display apparatus; And a touch panel according to item 1, arranged on the viewing side of the display device.

In the present invention, the pressing angle at a point of 1.5 mm distance from the electrode provided at the end of the first panel plate is input at a point 1.5 mm away from the electrode with respect to the lower panel plate from the upper panel plate side, as shown in FIG. When the pen is pressed, it means the angle θ between the lower surface of the upper panel plate P1 and the upper surface of the lower panel plate P2.

Embodiments of the present invention will be described below with reference to the drawings.

1 illustrates an embodiment of a touch panel in which the upper panel plate on the pen input side has a plastic film as the base layer and the lower panel plate has glass as the base layer.

In Fig. 1, P1 is an upper panel plate on the pen input side having a plastic film as the base layer, and P2 is a lower panel plate having glass as the base layer.

In the upper panel plate P1, one surface of the transparent base layer 1 made of a plastic film through the transparent first dielectric film 2 and the transparent second dielectric film 3 is transparent conductive thin films 4 and 4a. Is formed. The transparent base layer 6 made of another plastic film is attached to the other side via the transparent adhesive layer 5. The hard coat treatment layer 7 is formed on the uppermost surface of the pen input side of the base layer 6.

In the lower panel plate P2, a transparent conductive thin film 4b is formed on one surface of the transparent substrate 11 made of a glass plate. The lower panel plate P2 and the upper panel plate P1 are disposed to face each other with the spacer 8 therebetween so that the conductive thin films 4a and 4b also face each other.

In the touch panel constructed as described below, the gap between the upper panel plate P1 and the lower panel plate P2 is reduced, and the distance d between the conductive thin films 4a and 4b is reduced. It is set to 20-100 micrometers, Preferably it is 30-70 micrometers, and the pressing angle in the point of 1.5 mm distance from the electrode provided in the edge part of the said panel board is 3.9 degrees or less.

As a result, since the durability of the short-press input pen is improved, it is possible to cope with the narrow edge end of the touch panel. If the distance d between the conductive thin films 4a and 4b is smaller than 20 mu m, the Newton ring phenomenon, which is one of the evaluation elements of the touch panel, tends to appear.

FIG. 2 shows an embodiment of a touch panel in which the upper panel plate and the lower panel plate on the pen input side have a plastic film as the base layer, and the lower panel plate is attached to the glass plate of the display device through the adhesive layer.

As shown in FIG. 1, in the upper panel plate P1, the transparent conductive films 4 and 4a are made of a plastic film through the transparent first dielectric film 2 and the transparent second dielectric film 3. It is formed on one surface of the base layer (1). The transparent base layer 6 made of another plastic film is attached to the other surface via the transparent adhesive layer 5. The hard coat treatment layer 7 is formed on the uppermost surface of the pen input side of the base layer 6.

In the lower panel plate P3, a transparent conductive thin film 4c is formed on one surface of the transparent base layer 12 made of a plastic film. The lower panel plate P3 and the upper panel plate P1 are disposed to face each other with the spacer 8 interposed therebetween, whereby the conductive thin films 4a and 4c also face each other. In addition, the lower panel plate P3 is attached onto the glass plate 14 of the display device such as a liquid crystal cell through the transparent conductive adhesive layer 13.

In the touch panel configured as described above, the gap between the upper panel plate P1 and the lower panel plate P3 is reduced, and the distance d between the conductive thin films 4a and 4c is 20 to 100 μm, Preferably it is set to 30-70 micrometers, and the thickness t of the adhesive bond layer which adheres the base layer 12 to the glass plate 14 is set to 2-30 micrometers, Preferably it is set to 2-20 micrometers, and the said panel board The pressing angle at a point of 1.5 mm distance from the electrode provided at the end of is less than or equal to 3.9 °.

As a result, since the durability of the short-press input pen is improved, it is possible to cope with the narrow edge end of the touch panel. If the distance d between the conductive thin films 4a and 4c is smaller than 20 mu m, the Newton ring phenomenon, which is one of the evaluation elements of the touch panel, tends to appear. When the thickness t of the adhesive bond layer 13 is smaller than 2 micrometers, it is difficult to fully adhere to the glass plate 14.

1 and 2, the upper panel plate P1 is the same as the structure of the lower panel plate P3 shown in FIG. 2, that is, a transparent conductive thin film is simply formed on one surface of the transparent base layer made of a plastic film. However, in order to improve the durability of the short press input pen, the upper panel plate P1 preferably has the structure shown in the figure.

In the structure shown in the figure, the material of the transparent base layer 1 is not particularly limited. For example, polyester resin, acetate resin, polyether sulfone resin, polycarbonate resin, polyamide resin, polyimide resin, polyolefin resin, polyvinyl chloride resin, polystyrene resin, polyvinyl alcohol resin, polyallylate resin, poly Plastic membranes of phenyline-sulfide resins, polyvinylidene chloride resins, or (meth-) acrylic resins can be used. Among these plastic films, plastic films made of polyester resins, polycarbonate resins, and polyolefin resins are preferable.

The thickness of the transparent base layer 1 made of such a plastic film should be 2 to 120 µm, preferably 6 to 100 µm. If the thickness is smaller than 2 mu m, the mechanical strength as the base layer is insufficient, and thus, it is difficult to form a roll-shaped base layer to continuously form the dielectric thin film, the conductive thin film, and the adhesive layer. If this thickness exceeds 120 µm, it is difficult to improve durability such as friction resistance and bend resistance of the conductive thin film 4 based on the friction resistance and the cushioning effect of the adhesive layer 5 to be described below.

In order to improve the adhesion of the dielectric thin film provided on the transparent base layer 1 to the base layer, the transparent base layer 1 made of the plastic film is sputtered, corona discharge, flame treatment, ultraviolet irradiation, electron beam irradiation, conversion treatment. (conversion treatment) or oxidative etching treatment or priming treatment can be received in advance. Prior to providing the dielectric thin film, dust removal and washing may be performed by solvent washing, ultrasonic washing, and the like as necessary.

The conductive thin films 4 and 4a are formed on one surface of the transparent base layer 1. As a base for the conductive thin films 4 and 4a, the transparent dielectric thin film 2 and the transparent second dielectric thin film 3 are laminated in this order. These dielectric thin films 2 and 3 may not be provided in some cases. However, the dielectric thin films 2 and 3 can be provided to improve durability for the short press input pen.

First and second as an example of a dielectric thin film material, NaF, Na ₃ AlF _6, LiF, MgF _2, CaF _2, BaF _2, SiO _2, LaF _3, CeF _3, and the inorganic material, an acrylic resin such as Al ₂ O ₃ Organic compounds such as urethane resins, melamine resins, alkyd resins, and siloxane polymers, and mixtures of the inorganic and organic materials.

Among these materials, an organic material or a mixture of organic and inorganic materials is preferred as the material of the first dielectric thin film. In particular, the use of thermoplastic resins consisting of melamine resins, alkyd resins, and organic silane concentrates is preferred. In addition, inorganic or organic and mixtures of inorganic substances are preferred as the material of the second dielectric thin film. In particular, the use of such as _{SiO 2, MgF 2, Al 2} O 3 is preferred.

The above-mentioned materials can be used to form the first and second dielectric thin films by vacuum evaporation, sputtering, ion plating, coating, and the like.

The thickness of the first dielectric thin film is preferably 100 to 250 mu m, more preferably 130 to 200 mu m. The thickness of the second dielectric thin film is preferably 15 to 100 µm, more preferably 20 to 60 µm.

The first dielectric thin film 2 and the second dielectric thin film 3 are the base, and the transparent conductive thin films 4 and 4a are provided thereon.

This conductive thin film can be formed in the same manner as in the case of the base thin film described above. The thin film material used is not particularly limited. For example, use of tin oxide containing indium oxide, antimony containing tin oxide, etc. is preferable.

The thickness of the conductive thin film is 10 nm or more, preferably 10 to 300 nm. If the thickness is less than 10 nm, the conductive thin film is unlikely to be a continuous coating having satisfactory electrical conductivity with a surface resistance of 10 ³ Ω / □ or less. If this thickness is very large, transparency tends to be inferior.

A transparent base layer 6 made of another plastic film is attached to the other surface of the transparent base layer 1 on which the transparent conductive thin films 4 and 4a are formed through the base thin film.

It is possible for the adhesive layer 5 to be provided to the base layer 6 and for the base layer 1 to be attached to the adhesive layer 5, or vice versa, the adhesive layer 5 to the base layer 1. It is also possible for the base layer 6 to be provided and attached to the adhesive layer 5. In addition, the base layer 1 is thinner than the base layer 6. Thus, it is possible to form the adhesive layer 5 continuously by forming the base layer 1 in a roll shape by the latter method, which is advantageous in terms of productivity.

The adhesive layer 5 should have transparency. For example, acrylic adhesives, silicone adhesives, rubber adhesives and the like are used. The adhesive layer 5 has properties such as friction resistance and bending resistance of the conductive thin film 4a provided on one surface of the base layer 1 according to the cushioning effect of the base layer 6 after the base layer 6 is attached. Improve. In order to show this function better, the elastic coefficient of the adhesive layer 5 is 1 × 10 ⁵ to 1 × 10 ⁷ dyn / cm ² , and the thickness of the adhesive layer is 1 μm or more, more preferably 5. ˜100 μm.

If the elastic modulus of the adhesive layer 5 is less than 1 × 10 ⁵ dyn / cm ² , since the adhesive layer 5 is changed to non-elastic, the adhesive layer 5 is easily deformed by pressure, and thus the base layer 1 and Uneveness is caused in the conductive thin film 4a. In addition, the adhesive tends to be pushed out from the machine cutting surface, and the improvement effects such as the friction resistance and the flex resistance of the conductive thin film 4a are reduced. In addition, if the modulus of elasticity exceeds 10 ⁷ dyn / cm ² , the adhesive layer is cured, and the cushioning effect of the adhesive layer cannot be expected, and properties such as friction resistance and flex resistance are not improved.

If the thickness of the adhesive layer 5 is smaller than 1 占 퐉, no cushion effect can be expected, and thus it is difficult to improve characteristics such as friction resistance and bend resistance of the conductive thin film 4a. In addition, if the adhesive layer is too thick, transparency is impaired, and satisfactory results are hardly obtained in terms of formation of the adhesive layer, workability of attaching the base layer 6 and cost.

The base layer 6 adhered to the transparent base layer 1 via the adhesive layer 5 imparts satisfactory mechanical strength to the base layer 1, and in particular contributes to the prevention of curls and the like. Thus, for example, it is preferable that a plastic film having a thickness of about 6 to 300 mu m thicker than the base layer 1 is used as the base layer 6, for example. Examples of the material of the plastic film include the same material as the material of the base layer 1.

The hard coating layer 7 is formed on the uppermost surface of the pen input side of the base layer 6 to improve the friction resistance and the like for the pen input. As the hard coating layer 7, it is preferable to use a cured coating made of a curable resin such as, for example, melanin resin, urethane resin, alkyd resin, acrylic resin and silicone resin. For the purpose of improving visual perception, other surface treatment layers such as anti-glare layers and anti-reflective layers may be formed together with or instead of the hard coat layer 7.

In the touch panel shown in FIG. 1, the lower panel plate P2 has a conductive thin film 4b formed on one surface of the base layer 11 made of a transparent glass plate. This conductive thin film 4b can be manufactured by the same method using the same material as the conductive thin film 4a of the upper panel board P1.

In the touch panel shown in FIG. 2, the lower panel plate P3 has a conductive thin film 4c formed on one surface of the transparent base layer 12 made of a plastic film. A film of the same material and the same thickness as the base layer 6 forming the upper panel plate P1 of FIG. 1 is used as the base layer 12. This conductive thin film 4c can be manufactured by the same method using the same material as the conductive thin film 4a of the upper panel board P1.

The lower panel substrate P3 is attached to the glass plate 14 of the display device such as a liquid crystal cell through the transparent adhesive layer 13. An adhesive layer of the same material as the adhesive layer 5 forming the upper panel plate P1 of FIG. 1 is used as the adhesive layer 13.

In the present invention, it is also possible to provide an image display apparatus having the above-described touch panel disposed on the viewing surface side of the display apparatus. For example, in the touch panel shown in FIG. 2, the glass plate 14 constitutes a viewing angle side of the display device, and the image display device has a configuration in which the touch panel is disposed directly on the display device through the adhesive layer 13. May be provided. In addition, in the case of the touch panel illustrated in FIG. 1, an image display apparatus having a configuration in which the lower panel plate P2 of the touch panel is disposed on the viewing surface side of the display apparatus in an appropriate manner may be provided.

(Example)

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the scope of the present invention should not be construed as being limited thereto.

Hereinafter, "parts" and "%" mean "parts by weight" and "% by weight" respectively. The refractive index of light was measured with an Abbe refractometer.

(Example 1)

Fabrication of Transparent Conductive Film

25 μm thick polyethylene terephthalate membrane (hereinafter referred to as “PET membrane”) using a thermosetting resin (photorefractive index of 1.54) consisting of a mixture of melamine resins, alkyd resins, and organic silane condensates in a weight ratio of 2: 2: 1. On the one side of the base layer made of a transparent first dielectric thin film was formed to a thickness of 150 nm.

Next, a silica sol ("Colcoat" manufactured by Colcoat) was diluted with ethanol to a solid content concentration of 2%, applied over the first dielectric thin film, dried and cured at 150 ° C. for 2 minutes, to a thickness of about 30 nm. _A transparent second dielectric thin film consisting of _two thin films (light refractive index of 1.46) was formed.

Subsequently, a 20 nm thick transparent conductive thin film (hereinafter referred to as an "ITO thin film") made of a composite oxide of indium oxide and tin oxide (2.00 with a refractive index) contains 80% of argon gas and 20% of oxygen gas. It is formed on the second dielectric thin film by reactive sputtering using an alloy of indium 97% and tin 3% in an atmosphere of 10 ³ Torr.

Fabrication of Hard Coating Layer

 As photopolymerization initiator, 5 parts of hydroxyl-cyclohexyl-phenylketone ("Irgacure 184" manufactured by Chiba Specialty Chemicals) were added to 100 parts of acrylic urethane resin (Unic 17-806 manufactured by Danippon Ink and Chemicals, Incorporated). Toluene solution diluted to 50% was applied, dried at 100 ° C. for 3 minutes, and then immediately irradiated with two ozone high pressure mercury lamps (80 W / cm, 15 cm condensing), A 5 μm thick hard coat layer was formed on the entire surface of the base layer made of a 125 μm thick PET film. As a result, a hard coat treatment film is produced.

Fabrication of Transparent Conductive Lamination Film

1 part isocyanate in 100 parts of acrylic copolymer in which the elastic modulus of elasticity is adjusted to 1 × 10 ⁶ dyn / cm ² (butylacrylate, acrylic acid, and vinyl acetate mixed in a weight ratio of 100: 2: 5). Cross-linking agent) is formed about 20 μm thick on the other side of the base layer forming the transparent conductive film. The transparent conductive laminated film is formed on the adhesive layer by attaching the hard coating layer on the opposite side of the hard coating layer of the base layer.

Fabrication of Touch Panel with Membrane / Glass Configuration

A transparent conductive laminated film is used as the upper panel plate on the pen input side. In the same manner as described above, a panel plate having a 30 nm thick ITO thin film formed on the glass plate is used as the lower panel plate. The two panel plates are arranged to face each other with a spacer having a thickness of 10 µm therebetween, and the ITO thin films also face each other, and the distance between the ITO thin films is 60 µm as a gap between the two panel plates.

Each of the ITO thin films of both panel plates is formed orthogonal to each other before both panels are disposed opposite each other. In addition, in order to use the silver electrode 40 as a voltage measurement terminal, as shown in FIG. 3, the silver electrode 40 is formed at both ends of both plates P1 and P2.

(Example 2)

The touch panel was manufactured in the same manner as in Example 1, except that the distance between the ITO thin films was adjusted to 30 mu m as a gap between both panel plates.

(Example 3)

A touch panel is manufactured in the same manner as in Example 1, except that the distance between the ITO thin films is set to 100 m as the gap between both panel plates.

(Comparative Example 1)

The touch panel is manufactured in the same manner as in the method of Example 1, except that the distance between the ITO thin films is set to 120 m as the gap between both panel plates.

(Comparative Example 2)

A panel plate having an ITO thin film having a thickness of 30 nm formed on one side of the 125 μm thick PET film and a 5 μm thick hard coating layer formed on the other side of the pen input side was used instead of the transparent conductive laminated film of Example 1 The touch panel was manufactured in the same manner as in Example 1, except that it was used as the upper panel plate on the side.

In each of the touch panels of Examples 1 to 3 and Comparative Examples 1 and 2, as shown in FIG. 4, the input pen 10 is 1.5mm from the silver electrode 40 (r = 1.5mm in FIG. 3). The pressing angle θ was measured when pressed against the lower panel plate P2 from the upper panel plate P1 at the in point). In addition, the durability with respect to a single-press pen input was measured by the method demonstrated below.

The results of this measurement are shown in Table 1. In FIG. 1 the distance d between the ITO thin films is also represented by the gap between the lower and upper panel plates.

Durability for single-press pen input

A pen made of polyacetal (pen tip R 0.8 mm) slides 100,000 times with a load of 250 g from the upper panel plate side. The position from the end of the panel plate having a linearity of 1.5% or less after sliding is measured by the distance r from the silver electrode 40 of the upper panel P1 shown in FIG. The distance r becomes small, so that the touch panel is excellent in durability against a short press pen input. Linearity was measured by the method described below.

How to measure linearity

A voltage of 5 V is applied to the ITO thin film of the touch panel to measure the output voltage between the terminal (A, measurement start position) and the terminal (B, measurement end position) to which the voltage is applied.

The output voltage at the measurement start position (A) is E _A , the output voltage at the termination position (B) is E _B , the output voltage at each measurement position (X) is E _X , and the logic value is E _XX . When the linearity is calculated by the following equation.

E _XX (Theoretical Value) = X (E _B- E _A ) / (BA) + E _A

% Linearity = [(E _XX -E _X ) / (E _B- E _A )] × 100

The outline of the linearity is shown in FIG. 5.

In a display using a touch panel, when the touch panel is pressed by the input pen, the position of the pen appearing on the screen is determined by the resistance values at the contact portions of the upper panel plate and the lower panel plate. This resistance value is determined on the assumption that the output voltage distributed on the surfaces of the upper and lower panel plates is represented by a theoretical line (ideal line).

Then, if the voltage value deviates from the theoretical line as in the actual measured value of Fig. 5, the position of the pen on the screen determined by the actual pen position and the resistance value does not tune well. The deviation from the theoretical line is the linearity. As the value of the linearity decreases, the difference between the position of the actual pen and the position of the pen on the screen becomes smaller. Therefore, if the linearity is 1.5% or less, the linearity is judged satisfactory and the position (distance from the end) is measured.

TABLE 1

  Distance d (μm) between ITO thin films   Pressing angle of the input pen at the point r = 1.5 mm θ (˚) Durability against single-press pen input (position from silver electrode: distance r) (mm)       Example 1          60         2.3         1.1       Example 2          30         1.1         0.6       Example 3         100         3.8         1.5       Comparative Example 1         120         4.6         1.9       Comparative Example 2          60         2.3         5.0

 As clearly shown in Table 1, in each of the touch panels of Examples 1 to 3, the distance between the ITO thin films was set to 30 to 100 µm as a gap between both panels, so that r = 1.5 from the silver electrode provided at the end of the panel. The pressing angle θ at the mm point is 3.9 degrees or less. As a result, compared with the touch panels of Comparative Examples 1 and 2 which do not employ the configuration of the present invention, the touch panel of the present invention is excellent in durability against a single-press pen input and the edge area of the touch panel is less than 1.5 mm. Can be controlled.

Example 4

Production of touch panel of film / film composition

The transparent conductive laminated film prepared in Example 1 is used as the upper panel plate on the pen input side. A panel plate having a 30 nm thick ITO thin film formed in the same manner as in Example 1 on a base layer made of a 125 μm thick PET film is used as the lower panel plate. Both panel plates are arranged to face each other with a spacer having a thickness of 10 mu m, so that the ITO thin films face each other and the distance between the ITO thin films is 60 mu m as a gap between both panel plates.

Next, the elastic modulus is 1 × 10 ⁶ dyn / cm ² This touch panel is about 20 μm thick with an acrylic transparent adhesive layer (one part of isocyanate crosslinker mixed with 100 parts of acrylic copolymer in which butyl acrylate, acrylic acid, and vinyl acetate are mixed in a weight ratio of 100: 2: 5). It is formed on the opposite surface of the ITO thin film formed on the surface of the lower panel plate. This touch panel was laminated on the glass substrate of the liquid crystal display via an adhesive layer, thereby producing a touch panel integrated display shown in FIG.

(Example 5)

A touch panel integrated display is manufactured in the same manner as in Example 4, except that the distance between the ITO thin films is set to 30 m as the gap between both panel plates.

(Example 6)

A touch panel integrated display is manufactured in the same manner as in Example 4, except that the distance between the ITO thin films is set to 80 m as the gap between both panel plates.

(Example 7)

The touch panel integrated display is the same as that of Example 4, except that the distance between the ITO thin films is set to 30 m as the gap between both panel plates and the thickness of the adhesive layer for adhering the touch panel to the liquid crystal display is set to 10 m. Prepared in the same way.

(Comparative Example 3)

The touch panel integrated display is manufactured in the same manner as in Example 4, except that the distance between the ITO thin films is set to 120 m as the gap between both panel plates.

(Comparative Example 4)

The touch panel integrated display is manufactured by the same method as the comparative example 3 except that the thickness of the adhesive bond layer for adhering a touch panel to a liquid crystal display is set to 40 micrometers.

(Comparative Example 5)

A panel plate having a 30 nm thick ITO thin film formed on the surface of a 125 μm thick PET film and a 5 μm thick hard coat treatment layer formed on the other side of the pen input side was used instead of the transparent conductive laminated film in Example 1 on the pen input side. Except for being used as an upper panel plate, a touch panel integrated display is manufactured in the same manner as in Comparative Example 3.

In each of the touch panel integrated displays of Examples 4 to 7 and Comparative Examples 3 to 5, in the same manner as described above, the input pen was moved from the upper panel plate at a point of 1.5 mm from the silver electrode (see Fig. 4). The pressing angle θ when pressed against the lower panel plate was measured. In addition, the endurance for the single-press pen input was measured by the method described above.

The measurement results are shown in Table 2. Table 2 shows the distance d between the ITO thin film as a gap between the upper and lower panel plates and the thickness t of the adhesive layer for attaching the lower panel plate to the liquid crystal display.

<Table 2>

 Distance d (μm) between ITO thin films  Thickness of adhesive layer t (㎛) Pressing angle of the input pen at the point r = 1.5 mm θ (˚) Durability against single-press pen input (position from silver electrode: distance r) (mm)     Example 4        60        20       3.1       1.2     Example 5        30        20       1.9       0.9     Example 6        80        20       3.8       1.6     Example 7        30        10       1.5       0.7     Comparative Example 3       120        20       5.4       2.3     Comparative Example 4       120        40       6.1       2.5     Comparative Example 5       120        20       5.4       4.0

As clearly shown in Table 2, in each of the touch panel integrated displays of Examples 4 to 7, the distance between the ITO thin films is set to 30 to 80 μm as a gap between both panels, and an adhesive for attaching the touch panel to the liquid crystal display The thickness t of the layer is set to 10 to 20 µm, and the pressing angle θ at the point r = 1.5 mm from the silver electrode is 3.9 degrees or less. As a result, compared with the touch panel integrated display of Comparative Examples 3 to 5, which does not adopt the configuration of the present invention, the touch panel integrated display of the present invention is excellent in durability against a single-press pen input and border area of the touch panel. Can be controlled to less than 1.6mm.

As such, the present invention provides a panel having a plastic film as a base layer in which the gap between the upper and lower panel plates is reduced and the distance between the conductive films is set to a specific range, and the base layer made of plastic film is also used for the lower panel plate. A touch panel using a plate can be provided. In the touch panel, the gap is reduced and the thickness of the adhesive layer for attaching the lower panel plate to the glass substrate of the display device is set in a specific range, so that the pressing at the point r = 1.5 mm from the electrode provided at the end of the panel The angle is below the fixed value. Therefore, it is possible to improve the durability of the short press pen input which can satisfy the requirements of the narrow edge end.

Although the present invention has been described in detail with reference to specific embodiments, various modifications and changes are possible to those skilled in the art without departing from the spirit or scope of the present invention.

The present invention is Japanese Patent Application No. 1 filed on June 1, 2004. 2004-162724, and No. Filed March 23, 2005. Based on 2005-083642, the contents of which are related by reference.

In a touch panel using a panel plate having a base layer comprising the plastic film of the present invention, durability to a pen input near an electrode provided at the end of the panel plate is improved.

Claims (5)

In the touch panel, A first panel plate having a first base layer and a first conductive thin film disposed on one side of the first base layer; A second panel plate having a second base layer and a second conductive thin film disposed on one side of the second base layer; A second adhesive layer; And A third base layer comprising a plastic film, The first panel plate and the second panel plate are disposed with a spacer therebetween, so that the first conductive thin film and the second conductive thin film face each other, The distance between the first conductive thin film and the second conductive thin film is 20 ~ 100 ㎛, The touch panel has a pressing angle of 3.9 ° or less at a point of 1.5 mm distance from an electrode provided at an end of the first panel plate The first base layer has a thickness of 2 ~ 120 ㎛, The third base layer is disposed through the second adhesive layer on the other side of the first base layer opposite to the side on which the first conductive thin film is disposed, And the first base layer is a pen input side base layer. The touch panel of claim 1, wherein the first base layer comprises a plastic film and the second base layer comprises a glass layer. The apparatus of claim 1, further comprising a first adhesive layer having a thickness of 2 to 30 μm, wherein the second panel plate is disposed on the glass plate of the image display apparatus through the first adhesive layer, The first base layer includes a plastic film, and the second base layer includes a plastic film. delete An image display device, Display devices; And An image display apparatus comprising the touch panel according to claim 1 arranged on the visual side of the display apparatus.

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